FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
tonylin1
Staff
Staff
Article Id 372700
Description This article describes why the ARP IP address is not visible in the GUI -> Users & Devices -> Devices Inventory.
Scope FortiGate.
Solution
  1. Sometimes it only shows the MAC address without the IP address of a device in the Devices Inventory.

 

截圖 2025-01-27 下午3.49.28.png

 

  1. But there is an IP address record in the ARP table for that MAC address 70:4c:a5:ea:0f:4a.


    diagnose ip arp list | grep 4a

    index=17 ifname=port17 10.1.212.21 70:4c:a5:ea:0f:4a state=00000002 use=178 confirm=321 update=5855151 ref=3

     

  2. To make that MAC address have an IP address as seen in the example below: 10.1.212.18 => 70:4c:a5:ea:06:07.

    截圖 2025-01-27 下午4.01.57.png

     

  3. Set up a local DHCP server on FortiGate to assign an IP address for the device, the Device inventory can extract the IP address from the DHCP lease info.